1 #ifndef __ASM_ARM_SYSTEM_H
2 #define __ASM_ARM_SYSTEM_H
6 #define CPU_ARCH_UNKNOWN 0
7 #define CPU_ARCH_ARMv3 1
8 #define CPU_ARCH_ARMv4 2
9 #define CPU_ARCH_ARMv4T 3
10 #define CPU_ARCH_ARMv5 4
11 #define CPU_ARCH_ARMv5T 5
12 #define CPU_ARCH_ARMv5TE 6
13 #define CPU_ARCH_ARMv5TEJ 7
14 #define CPU_ARCH_ARMv6 8
15 #define CPU_ARCH_ARMv7 9
18 * CR1 bits (CP#15 CR1)
20 #define CR_M (1 << 0) /* MMU enable */
21 #define CR_A (1 << 1) /* Alignment abort enable */
22 #define CR_C (1 << 2) /* Dcache enable */
23 #define CR_W (1 << 3) /* Write buffer enable */
24 #define CR_P (1 << 4) /* 32-bit exception handler */
25 #define CR_D (1 << 5) /* 32-bit data address range */
26 #define CR_L (1 << 6) /* Implementation defined */
27 #define CR_B (1 << 7) /* Big endian */
28 #define CR_S (1 << 8) /* System MMU protection */
29 #define CR_R (1 << 9) /* ROM MMU protection */
30 #define CR_F (1 << 10) /* Implementation defined */
31 #define CR_Z (1 << 11) /* Implementation defined */
32 #define CR_I (1 << 12) /* Icache enable */
33 #define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
34 #define CR_RR (1 << 14) /* Round Robin cache replacement */
35 #define CR_L4 (1 << 15) /* LDR pc can set T bit */
36 #define CR_DT (1 << 16)
37 #define CR_IT (1 << 18)
38 #define CR_ST (1 << 19)
39 #define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
40 #define CR_U (1 << 22) /* Unaligned access operation */
41 #define CR_XP (1 << 23) /* Extended page tables */
42 #define CR_VE (1 << 24) /* Vectored interrupts */
43 #define CR_EE (1 << 25) /* Exception (Big) Endian */
44 #define CR_TRE (1 << 28) /* TEX remap enable */
45 #define CR_AFE (1 << 29) /* Access flag enable */
46 #define CR_TE (1 << 30) /* Thumb exception enable */
49 * This is used to ensure the compiler did actually allocate the register we
50 * asked it for some inline assembly sequences. Apparently we can't trust
51 * the compiler from one version to another so a bit of paranoia won't hurt.
52 * This string is meant to be concatenated with the inline asm string and
53 * will cause compilation to stop on mismatch.
54 * (for details, see gcc PR 15089)
56 #define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
60 #define isb() __asm__ __volatile__ ("" : : : "memory")
62 #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
64 #ifdef __ARM_ARCH_7A__
65 #define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
70 static inline unsigned int get_cr(void)
73 asm("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
77 static inline void set_cr(unsigned int val)
79 asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
80 : : "r" (val) : "cc");
84 static inline unsigned int get_dacr(void)
87 asm("mrc p15, 0, %0, c3, c0, 0 @ get DACR" : "=r" (val) : : "cc");
91 static inline void set_dacr(unsigned int val)
93 asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR"
94 : : "r" (val) : "cc");
98 /* options available for data cache on each page */
101 DCACHE_WRITETHROUGH = 0x1a,
102 DCACHE_WRITEBACK = 0x1e,
105 /* Size of an MMU section */
107 MMU_SECTION_SHIFT = 20,
108 MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT,
112 * Change the cache settings for a region.
114 * \param start start address of memory region to change
115 * \param size size of memory region to change
116 * \param option dcache option to select
118 void mmu_set_region_dcache_behaviour(u32 start, int size,
119 enum dcache_option option);
122 * Register an update to the page tables, and flush the TLB
124 * \param start start address of update in page table
125 * \param stop stop address of update in page table
127 void mmu_page_table_flush(unsigned long start, unsigned long stop);
129 #endif /* __ASSEMBLY__ */
131 #define arch_align_stack(x) (x)
133 #endif /* __KERNEL__ */